PHP Error

Use of undefined constant WEBMASTER_EMAIL - assumed 'WEBMASTER_EMAIL'

File: /home/dayoftheviper/public_html/websites_v4_test/include/footer.php

Line: 29

Stack:
#0 __construct called at [/home/dayoftheviper/public_html/websites_v4_test/links.php:10]
#1 control called at [/home/dayoftheviper/public_html/websites_v4_test/links.php:38]
#2 displayPage called at [/home/dayoftheviper/public_html/websites_v4_test/links.php:44]
#3 displayFooter called at [/home/dayoftheviper/public_html/websites_v4_test/links.php:119]
#4 require_once called at [/home/dayoftheviper/public_html/websites_v4_test/links.php:75]
#5 sdwErrorHandler called at [/home/dayoftheviper/public_html/websites_v4_test/include/footer.php:29]

PHP: 5.6.40 (Linux)